Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8877ac5dda5f3e6…

MALICIOUS

PDF

74.9 KB Created: 2021-09-01 19:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe1246a2d69cc984df5299c6b6cc9bcd SHA-1: a3862f3bc4a96f88f72614588835e2a122addb48 SHA-256: d8877ac5dda5f3e6480dc2964bce18de9533d15b39c74f0031e91e12aa196556
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM strongly supports this attack pattern. No scripts were extracted, but the PDF structure itself is used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://galluccifaibano.it/userfiles/file/72705787380.pdf In PDF document text
    • http://world-green-hope.com/uploads/files/vunujuno.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16074cf2e93d11---67666522432.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c474c3e711e---41107903507.pdfIn PDF document text
    • http://chromatographvials.com/d/files/27991845519.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/a25r54dg117ic8pq488of42p9m/puzovijuxajawepazag.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/88kog4o6mhj4udj9mdsn8e0uui/kajox.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/87763662874.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/xegugevuma.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/34497950453.pdfIn PDF document text
    • http://immopolignano.lu/images/49192440302.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/19035414862.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5c67bbaec822f25a259343f1783a1c12/77754005228.pdfIn PDF document text
    • http://abc-tel.ru/data/File/nagulegaribe.pdfIn PDF document text
    • http://birminghamseaholmclass63.com/clients/75362/File/25397786552.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/77444913182.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16105088ae4438---1813037150.pdfIn PDF document text
    • http://skupka54.ru/upload/m/dajadug.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/burutiwam.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/zuriribixewatedemora.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/37000979173.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/4fbcb0e9f0c74bcdd2e5bb3293cfabfc/80986639442.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/5tvtbotkr98i5731ekvud9pq1q/61954905730.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/c6cbadd9096de874f90c2e3094f2764b/52687500432.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/8069815516.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/57056546550.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0d007bfff---nebabemaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=about+the+author+walt+whitmanPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC146 17512 bytes
SHA-256: 54e960f5f81b67ef65cede42fdc6c1a6ba1475e4af997fb1549a5cd976929043
font_01_sfnt_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 10512 bytes
SHA-256: 21c446baa484a24567a8fdebcc83ba4785e104a36524a9cb4671cf1034d6a8aa

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